62 lines
1.9 KiB
ArmAsm
62 lines
1.9 KiB
ArmAsm
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/* AMD64 (x86_64) sub_n -- Subtract two limb vectors of the same length > 0 and store
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* sum in a third limb vector.
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*
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* Copyright (C) 1992, 1994, 1995, 1998,
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* 2001, 2002, 2006 Free Software Foundation, Inc.
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*
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* This file is part of Libgcrypt.
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*
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* Libgcrypt is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* Libgcrypt is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*
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* Note: This code is heavily based on the GNU MP Library.
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* Actually it's the same code with only minor changes in the
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* way the data is stored; this is to support the abstraction
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* of an optional secure memory allocation which may be used
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* to avoid revealing of sensitive data due to paging etc.
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*/
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#include "sysdep.h"
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#include "asm-syntax.h"
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/*******************
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* mpi_limb_t
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* _gcry_mpih_sub_n( mpi_ptr_t res_ptr, rdi
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* mpi_ptr_t s1_ptr, rsi
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* mpi_ptr_t s2_ptr, rdx
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* mpi_size_t size) rcx
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*/
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.text
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.globl C_SYMBOL_NAME(_gcry_mpih_sub_n)
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C_SYMBOL_NAME(_gcry_mpih_sub_n:)
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leaq (%rsi,%rcx,8), %rsi
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leaq (%rdi,%rcx,8), %rdi
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leaq (%rdx,%rcx,8), %rdx
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negq %rcx
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xorl %eax, %eax /* clear cy */
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ALIGN(4) /* minimal alignment for claimed speed */
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.Loop: movq (%rsi,%rcx,8), %rax
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movq (%rdx,%rcx,8), %r10
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sbbq %r10, %rax
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movq %rax, (%rdi,%rcx,8)
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incq %rcx
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jne .Loop
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movq %rcx, %rax /* zero %rax */
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adcq %rax, %rax
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ret
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